Questions About UPF constrains

[hjacky]

Hi, experts,

I have the following questions, would you please check the questions and see if can resolve?

one : Can multiple retention/level_shifter/isolation strategies set to one power domain?
two ：Have any summaries about the isolation/level_shifter usage scenarios in the design, i know retention have only one scenario, that it is set on cells within one power domain, but level shifter and isolation need to be inserted on power domain boundaries, so there are many scenarios about their insertion location.
there: need i explicitly write the command "map_retention_cell" in Design compiler? can't the tool mapping by itself if i gave it the full MV target library?

Thanks in advance!

 

[hjacky]

To question one, I got answers from experienced engineers that we can adopt different strategies within one power domain, please help with other questions, thanks in advance!